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Hello Everyone,
My dad recently gave me his old 94 fourtrax 300 that he bought when I was a kid. I am trying to get it back to running good and need a little help. The only issue it has at this point is a high idle. It doesn’t do it all the time but will randomly start happening while in neutral. The carb has been rebuilt and I have messed with throttle cable tension and idle pilot valve but since it is happening randomly I don’t think this is the issue. Any help would be much appreciated. Thanks, in advance.
 

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Probably the throttle cable dragging inside the housing and if not it could be a vacuum leak - I would try replacing the throttle cable first.
 
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